* * * FOR ALL
TASK 72-00-52-200-801
1 . General.
A.This procedure gives instructions to do an inspection of the high pressure turbine (HPT) stage 2 nozzle assembly (stage 2 nozzle assembly) (34-010 , 72-00-02) (SIN 17400) or (34-011 , 72-00-02) (SIN 17400). Refer to Figure 801.
B.Any sub-assembly or part removed for access or limited workscope must be inspected in accordance with criteria in this section. If there is no criteria, the sub-assembly or part must receive a general visual inspection (GVI) for continued serviceability. Refer to TASK 72-00-00-200-805 (72-00-00, INSPECTION 001) . If required, the component can be hand-cleaned to do a visual inspection. Refer to TASK 70-21-01-110-001 (CLEANING METHOD 1 - SOLVENT DEGREASING) or TASK 70-21-03-160-001 (CLEANING METHOD 3 - STEAM CLEANING) . GVI can not be done to components identified in TASK 05-21-00-200-801 (05-21-00, LIFE LIMITS 001) that become piece part. These components must have their appropriate mandatory inspections done, unless stated differently in an applicable Service Bulletin.
C.If you do this procedure and find an unserviceable assembly or part, refer to the applicable section of the engine manual for more disassembly and inspection procedures for the assembly or part.
D.If you will fully disassemble the stage 2 nozzle assembly, this inspection is not necessary. Refer to the applicable section of the engine manual for the inspection procedure for each part.
E.The maintenance instructions in this Manual do not purport to cover all details or variations in equipment, nor do they provide for every possible contingency to be met in connection with installation, operation, maintenance, or GEAE certified repair facilities. The maintenance instructions are intended to be all-inclusive for a complete teardown and overhaul of the component or sub assembly. The individual procedures as written are one sequence based on General Electric experience. Alternate sequences to these maintenance instructions are at the discretion of the operator and/or overhaul shop provided the intent of the maintenance instructions is met. The operator and/or overhaul shop can select specific tasks to partially disassemble and assemble hardware or subassemblies based upon the on demand maintenance requirement of the individual engine work scope provided the final assembly configuration and requirements contained in the manual have been met.
2 . Tools, Equipment, and Materials.
NOTE:
You can use equivalent alternatives for tools, equipment, and consumable materials.
A.Tools and Equipment.
(1)Special Tools. None.
(2)Standard Tools and Equipment. None.
(3)Locally Manufactured Tools. None.
B.Consumable Materials. None.
C.Referenced Procedures.
 
ATA No.
Description
 
05-21-00
Life Limits 001
 
70-21-01
Cleaning Method 1 - Solvent Degreasing
 
70-21-03
Cleaning Method 3 - Steam Cleaning
 
70-42-00
Blending and Removal of High Metal Procedures
 
72-00-00
Inspection 001
D.Expendable Parts. None.
3 . Visual Inspection.
Subtask 72-00-52-220-001
A.Do an inspection of all body surfaces of the HPT stator case (174B0) as follows. Refer to Figure 802.
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the HPT stator case.
* * * FOR ALL
Figure 801   (Sheet 1 ) Stage 2 Nozzle Assembly - Inspection
* * * FOR ALL
* * * PRE SB   72-0036
Figure 801   (Sheet 2 ) Stage 2 Nozzle Assembly - Inspection
* * * FOR ALL
* * * SB   72-0036
Figure 801   (Sheet 3 ) Stage 2 Nozzle Assembly - Inspection
* * * FOR ALL
Figure 801   (Sheet 4 ) Stage 2 Nozzle Assembly - Inspection
* * * FOR ALL
Figure 802   HPT Stator Case - Inspection
Subtask 72-00-52-220-002
(2)Nicks and scratches that are 0.025 inch (0.64 mm) in depth or less:
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Any amount.
Repair method:
Blend. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
Subtask 72-00-52-220-003
(3)Nicks and scratches that are more than 0.025 inch (0.64 mm) in depth:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the HPT stator case.
Subtask 72-00-52-220-004
(4)Dents:
Maximum serviceable limit:
Any amount, 0.125 inch (3.18 mm) in depth.
Repair method:
Replace the HPT stator case.
Subtask 72-00-52-220-005
B.Do an inspection of the case ports on the HPT stator case (174B0) as follows. Refer to Figure 802.
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the HPT stator case.
Subtask 72-00-52-220-096
C.Do an inspection of the HPT stage 2 nozzle air tubes (01-360 , 72-52-00) (SIN 174A4) and impingement ring (01-480 , 72-52-00) (SIN 174A9) air tube interface visible through the case ports on the HPT stator case (01-490 , 72-52-00) (SIN 174B0). Refer to Figure 801 and as follows:
(1)Wear:
Maximum serviceable limit:
Any amount.
Subtask 72-00-52-220-097
(2)Loose or missing air tubes:
Maximum serviceable limit:
Any amount.
Subtask 72-00-52-220-007
D.Do an inspection of the forward and aft mounting flanges of the HPT stator case (174B0) as follows. Refer to Figure 802.
(1)Cracks:
Maximum serviceable limit:
0.030 inch (0.76 mm) in length.
Repair method:
Replace the HPT stator case.
Subtask 72-00-52-220-008
(2)Nicks, scores, and scratches that are less than 0.010 inch (0.25 mm) in depth:
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
0.010 inch (0.25 mm) in depth, after the removal of high metal. Damage must not extend radially under the bolt or nut washer face.
Repair method:
Blend. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
Subtask 72-00-52-220-009
(3)Nicks, scores, and scratches that are more than 0.010 inch (0.25 mm) in depth:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the HPT stator case.
Subtask 72-00-52-220-010
(4)Bulges and dents:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the HPT stator case.
Subtask 72-00-52-220-011
E.Do an inspection of the borescope port threads on the HPT stator case (174B0) as follows. Refer to Figure 802.
(1)Thread damage:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the HPT stator case.
Subtask 72-00-52-220-012
F.Do an inspection of all body surface areas of each HPT stage 1 shroud hanger (stage 1 shroud hanger) (17301) as follows. Refer to Figure 803.
(1)Cracks (this does not include braze cracks):
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the stage 1 shroud hanger.
* * * FOR ALL
Figure 803   Stage 1 Shroud Hanger - Inspection
Subtask 72-00-52-220-013
(2)Braze cracks:
Maximum serviceable limit:
One crack, 0.050 inch (1.27 mm) in length, in the braze fillet.
Repair method:
Replace the stage 1 shroud hanger.
Subtask 72-00-52-220-014
(3)Nicks and scratches:
Maximum serviceable limit:
0.010 inch (0.25 mm) in depth, after the removal of high metal.
Repair method:
Replace the stage 1 shroud hanger.
Subtask 72-00-52-220-095
(4)Wear on surface G:
Maximum serviceable limit:
0.020 inch (0.51 mm) in depth.
Repair method:
Repair. Refer to TASK 72-00-52-300-801 (72-00-52, REPAIR 001) .
Subtask 72-00-52-220-015
G.Do an inspection of each HPT stage 1 shroud (stage 1 shroud) (17300) as follows. Refer to Figure 804.
(1)Axial cracks:
Maximum serviceable limit:
•
Any amount, 0.15 inch (3.8 mm)
•
Four, 0.85 inch (21.6 mm)
•
One crack fully across, if it is a minimum distance of 0.125 inch (3.18 mm) from other cracks.
Repair method:
Replace the stage 1 shroud.
* * * FOR ALL
Figure 804   Stage 1 Shroud - Inspection
Subtask 72-00-52-220-016
(2)Circumferential cracks:
Maximum serviceable limit:
Any amount, 0.375 inch (9.53 mm), 0.125 inch (3.18 mm) apart.
Repair method:
Replace the stage 1 shroud.
Subtask 72-00-52-220-017
(3)Radial cracks in the gas face wall:
Maximum serviceable limit:
Three across the forward wall, 0.50 inch (12.7 mm) apart.
Repair method:
Replace the stage 1 shroud.
Subtask 72-00-52-220-018
(4)Axial and circumferential cracks that connect:
Maximum serviceable limit:
•
At the shroud end: Connection of any axial and circumferential cracks up to the maximum limit of Subtask 72-00-52-220-015 (paragraph 3.G.(1)) thru Subtask 72-00-52-220-016 (paragraph 3.G.(2)).
•
Other areas: Connection of two cracks, axial and/or circumferential, up to the maximum limit of Subtask 72-00-52-220-015 (paragraph 3.G.(1)) thru Subtask 72-00-52-220-016 (paragraph 3.G.(2)). The shroud is not serviceable if a third crack connects.
Repair method:
Replace the stage 1 shroud.
Subtask 72-00-52-220-019
(5)Missing material:
Maximum serviceable limit:
Maximum area of 0.1 inch (3 mm) circumferentially x 0.75 inch (19.1 mm) axially, to the depth of the seal slot, from each end.
Repair method:
Replace the stage 1 shroud.
Subtask 72-00-52-220-093
(6)Nicks, dents, and scratches:
Maximum serviceable limit:
Any amount.
Repair method:
Replace the stage 1 shroud.
Subtask 72-00-52-220-094
(7)Rubs on the wear track:
Maximum serviceable limit:
0.005 inch (0.13 mm) in depth, along the full width of the segment.
Repair method:
Replace the stage 1 shroud.
Subtask 72-00-52-220-020
H.Do an inspection of all areas of each nozzle segment as follows. Refer to Figure 805.
•
Nozzle segment (01-370 , 72-52-00) (SIN 174A0)
•
Nozzle segment (01-371 , 72-52-00) (SIN 174A0) SB 72-0036
•
Nozzle segment (01-372 , 72-52-00) (SIN 174A0) SB 72-0036
•
Nozzle segment (01-380 , 72-52-00) (SIN 174A1)
•
Nozzle segment (01-381 , 72-52-00) (SIN 174A1) SB 72-0036
•
Nozzle segment (01-382 , 72-52-00) (SIN 174A1) SB 72-0036.
(1)Metal splatter:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the nozzle segment.
* * * FOR ALL
Figure 805   Nozzle Segment - Inspection
Subtask 72-00-52-220-021
(2)Corrosion (this does not include the vane airfoil):
NOTE:
Corroded areas are raised or discolored with a smooth surface and/or blisters.
Maximum serviceable limit:
Any amount, if the total area for each nozzle segment is less than 0.5 sq in. (323 sq mm) and if blisters did not open and cause pits.
Repair method:
Replace the nozzle segment.
Subtask 72-00-52-220-022
I.Do an inspection of the vane airfoils of each nozzle segment as follows. Refer to Figure 805.
•
Nozzle segment (01-370 , 72-52-00) (SIN 174A0)
•
Nozzle segment (01-371 , 72-52-00) (SIN 174A0) SB 72-0036
•
Nozzle segment (01-372 , 72-52-00) (SIN 174A0) SB 72-0036
•
Nozzle segment (01-380 , 72-52-00) (SIN 174A1)
•
Nozzle segment (01-381 , 72-52-00) (SIN 174A1) SB 72-0036
•
Nozzle segment (01-382 , 72-52-00) (SIN 174A1) SB 72-0036.
(1)Nicks, scores, scratches, and dents:
Maximum serviceable limit:
•
Aft 0.250 inch (6.35 mm) of the vane airfoil surface: Any amount, 0.25 inch (6.4 mm) in diameter and 0.030 inch (0.76 mm) in depth
•
Other areas: Any amount, 0.25 inch (6.4 mm) in diameter and 0.010 inch (0.25 mm) in depth.
Repair method:
Replace the nozzle segment.
Subtask 72-00-52-220-023
(2)Missing surface coat (does not include area E):
Maximum serviceable limit:
Any amount, if the total area missing from each vane airfoil is not more than 45 percent.
Repair method:
Replace the nozzle segment.
Subtask 72-00-52-220-090
(3)Missing surface coat in area E:
Maximum serviceable limit:
0.25 inch (6.4 mm) in diameter on each vane airfoil.
Repair method:
Replace the nozzle segment.
Subtask 72-00-52-220-024
(4)Corrosion (raised or discolored coating with smooth surface and/or blisters):
Maximum serviceable limit:
Any amount, if blisters did not open and cause pits.
Repair method:
Replace the nozzle segment.
Subtask 72-00-52-220-025
J.Do an inspection of the trailing edges of the vane airfoils of each nozzle segment as follows. Refer to Figure 805.
•
Nozzle segment (01-370 , 72-52-00) (SIN 174A0)
•
Nozzle segment (01-371 , 72-52-00) (SIN 174A0) SB 72-0036
•
Nozzle segment (01-372 , 72-52-00) (SIN 174A0) SB 72-0036
•
Nozzle segment (01-380 , 72-52-00) (SIN 174A1)
•
Nozzle segment (01-381 , 72-52-00) (SIN 174A1) SB 72-0036
•
Nozzle segment (01-382 , 72-52-00) (SIN 174A1) SB 72-0036.
(1)Axial cracks that are more than 0.40 inch (10.2 mm) from the inner and outer platform:
Maximum serviceable limit:
•
Any amount, 0.200 inch (5.08 mm) in length
•
Two for each vane airfoil, 0.50 inch (12.7 mm) in length, if the cracks are 0.25 inch (6.4 mm) apart.
Repair method:
Replace the nozzle segment.
Subtask 72-00-52-220-026
(2)Axial cracks or craze cracks that are less than 0.40 inch (10.2 mm) from the inner and outer platform:
Maximum serviceable limit:
Any amount, if none extend more than 0.50 inch (12.7 mm) forward of the aft edge.
Repair method:
Replace the nozzle segment.
Subtask 72-00-52-220-027
(3)Bowing:
Maximum serviceable limit:
Any length, 0.030 inch (0.76 mm) from the original contour.
Repair method:
Replace the nozzle segment.
Subtask 72-00-52-220-028
(4)Missing metal:
Maximum serviceable limit:
One location, 0.15 x 0.15 inch (3.8 x 3.8 mm) in width.
Repair method:
Replace the nozzle segment.
Subtask 72-00-52-220-029
(5)Blocked cooling slots in the trailing edge:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the nozzle segment.
Subtask 72-00-52-220-031
K.Do an inspection of the leading edges of the vane airfoils of each nozzle segment as follows. Refer to Figure 805.
•
Nozzle segment (01-370 , 72-52-00) (SIN 174A0)
•
Nozzle segment (01-371 , 72-52-00) (SIN 174A0) SB 72-0036
•
Nozzle segment (01-372 , 72-52-00) (SIN 174A0) SB 72-0036
•
Nozzle segment (01-380 , 72-52-00) (SIN 174A1)
•
Nozzle segment (01-381 , 72-52-00) (SIN 174A1) SB 72-0036
•
Nozzle segment (01-382 , 72-52-00) (SIN 174A1) SB 72-0036.
(1)Cracks:
Maximum serviceable limit:
•
One crack, 0.30 inch (7.6 mm) in length
•
No cracks permitted that are parallel to the outer platform in area E
•
Any amount of shallow cracks (craze cracks), if the surface coat is not broken and if the cracks are not parallel to the outer platform in area E.
Repair method:
Replace the nozzle segment.
Subtask 72-00-52-220-032
(2)Oxidation or burns through the coating with no parent metal attack:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the nozzle segment.
Subtask 72-00-52-220-033
(3)Erosion not through the surface coating:
Maximum serviceable limit:
Total damage no more than 0.25 sq in. (161.3 sq mm) in width for each vane airfoil.
Repair method:
Replace the nozzle segment.
Subtask 72-00-52-220-088
(4)Blocked cooling holes:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the nozzle segment.
Subtask 72-00-52-220-034
L.Do an inspection of the concave surfaces of the vane airfoils of each nozzle segment as follows. Refer to Figure 805.
•
Nozzle segment (01-370 , 72-52-00) (SIN 174A0)
•
Nozzle segment (01-371 , 72-52-00) (SIN 174A0) SB 72-0036
•
Nozzle segment (01-372 , 72-52-00) (SIN 174A0) SB 72-0036
•
Nozzle segment (01-380 , 72-52-00) (SIN 174A1)
•
Nozzle segment (01-381 , 72-52-00) (SIN 174A1) SB 72-0036
•
Nozzle segment (01-382 , 72-52-00) (SIN 174A1) SB 72-0036.
(1)Cracks (this does not include cracks from the cooling holes):
Maximum serviceable limit:
One, 0.250 inch (6.35 mm) in length, if the crack is a minimum of 0.500 inch (12.70 mm) from the inner and outer platform.
Repair method:
Replace the nozzle segment.
Subtask 72-00-52-220-035
(2)Cracks from the cooling holes:
Maximum serviceable limit:
Any amount less than 0.10 inch (2.5 mm) in length.
Repair method:
Replace the nozzle segment.
Subtask 72-00-52-220-036
(3)Oxidation or burns through the coating with no parent metal attack:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the nozzle segment.
Subtask 72-00-52-220-091
(4)Blocked cooling holes:
Maximum serviceable limit:
Not serviceable.
Repair method:
Remove the blockage.
Subtask 72-00-52-220-037
M.Do an inspection of the convex surfaces of the vane airfoils of each nozzle segment as follows. Refer to Figure 805.
•
Nozzle segment (01-370 , 72-52-00) (SIN 174A0)
•
Nozzle segment (01-371 , 72-52-00) (SIN 174A0) SB 72-0036
•
Nozzle segment (01-372 , 72-52-00) (SIN 174A0) SB 72-0036
•
Nozzle segment (01-380 , 72-52-00) (SIN 174A1)
•
Nozzle segment (01-381 , 72-52-00) (SIN 174A1) SB 72-0036
•
Nozzle segment (01-382 , 72-52-00) (SIN 174A1) SB 72-0036.
(1)Cracks (this does not include cracks from the cooling holes):
Maximum serviceable limit:
Any amount, 0.200 inch (5.08 mm) in length.
Repair method:
Replace the nozzle segment.
Subtask 72-00-52-220-092
(2)Cracks from the cooling holes:
Maximum serviceable limit:
Any amount less than 0.10 inch (2.5 mm) in length.
Repair method:
Replace the nozzle segment.
Subtask 72-00-52-220-038
(3)Oxidation or burns through the coating with no parent metal attack:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the nozzle segment.
Subtask 72-00-52-220-039
(4)Blocked cooling holes:
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Any amount.
Repair method:
Remove the blockage.
Subtask 72-00-52-220-040
N.Do an inspection of the inner and outer platform of each nozzle segment as follows. Refer to Figure 805.
•
Nozzle segment (01-370 , 72-52-00) (SIN 174A0)
•
Nozzle segment (01-371 , 72-52-00) (SIN 174A0) SB 72-0036
•
Nozzle segment (01-372 , 72-52-00) (SIN 174A0) SB 72-0036
•
Nozzle segment (01-380 , 72-52-00) (SIN 174A1)
•
Nozzle segment (01-381 , 72-52-00) (SIN 174A1) SB 72-0036
•
Nozzle segment (01-382 , 72-52-00) (SIN 174A1) SB 72-0036.
(1)Cracks on the inner platform:
Maximum serviceable limit:
•
Any amount, 0.50 inch (12.7 mm) in length
•
One, 1.10 inches (27.9 mm) in length, if the crack does not intersect with a perpendicular crack.
Repair method:
Replace the nozzle segment.
Subtask 72-00-52-220-042
(2)Cracks on the outer platform (this does not include the mounting flange):
Maximum serviceable limit:
•
Any amount, 0.50 inch (12.7 mm) in length
•
One, 1.10 inches (27.9 mm) in length, if the crack does not intersect with a perpendicular crack.
Repair method:
Replace the nozzle segment.
Subtask 72-00-52-220-043
(3)Cracks on the forward and aft mounting flanges and aft mounting hooks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the nozzle segment.
Subtask 72-00-52-220-044
(4)Nicks, scores, scratches, and dents on the platform surfaces:
Maximum serviceable limit:
Any amount, 0.020 inch (0.51 mm) in depth, after the removal of high metal.
Repair method:
Replace the nozzle segment.
Subtask 72-00-52-220-045
(5)Crazing (craze cracks are surface cracks that do not break the coating surface):
Maximum serviceable limit:
Any amount.
Repair method:
Replace the nozzle segment.
Subtask 72-00-52-220-046
(6)Missing surface coat:
Maximum serviceable limit:
•
On each platform edge: Any amount, not more than 0.30 inch (7.6 mm) in width, if total (cumulative) area is not more than 0.5 sq inch (323 sq mm) on any platform edge
•
Other areas: Any amount, 0.625 inch (15.88 mm) in diameter, or equivalent area, and 0.2 inch (5 mm) apart.
Repair method:
Replace the nozzle segment.
Subtask 72-00-52-220-047
(7)Cracks in the outer platform trailing edge:
Maximum serviceable limit:
•
Any amount, 0.12 inch (3.0 mm) in length
•
Two for each nozzle segment, 0.30 inch (7.6 mm) in length, if they are not less than 0.25 inch (6.4 mm) apart.
Repair method:
Replace the nozzle segment.
Subtask 72-00-52-220-048
(8)Heat distress (network of fine cracks):
Maximum serviceable limit:
Any amount.
Repair method:
Replace the nozzle segment.
Subtask 72-00-52-220-049
(9)Cracks on the forward and aft seal lips:
Maximum serviceable limit:
Two cracks, 0.250 inch (6.35 mm) in length, if they are not less than 0.25 inch (6.4 mm) apart.
Repair method:
Replace the nozzle segment.
Subtask 72-00-52-220-051
(10)Oxidation or erosion in the forward and aft seal lips:
Maximum serviceable limit:
Any amount if the total area is less than 0.50 sq inch (322.6 sq mm).
Repair method:
Replace the nozzle segment.
Subtask 72-00-52-220-052
(11)Distortion in the forward and aft seal lips:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the nozzle segment.
Subtask 72-00-52-220-053
(12)Rubs on the forward and aft seal lips:
Maximum serviceable limit:
Any amount, 0.010 inch (0.25 mm) in depth. One rub 0.020 inch 0.51 mm) in depth.
Repair method:
Replace the nozzle segment.
Subtask 72-00-52-220-054
(13)Missing metal or edge burn of seal slots on the flowpath side of the outer platform:
Maximum serviceable limit:
Any amount of missing metal or edge burning permitted, if the seal retention slot is there.
Repair method:
Replace the nozzle segment.
Subtask 72-00-52-220-056
(14)Missing metal on all other non-flowpath or flowpath areas of the seal slots, including seal slot break out at the forward end:
Maximum serviceable limit:
Any amount, 0.350 inch (8.89 mm) in length.
Repair method:
Replace the nozzle segment.
Subtask 72-00-52-220-057
(15)Oxidation or burns through the nozzle coating and parent metal attack at platform edges:
Maximum serviceable limit:
Any amount, 0.350 inch (8.89 mm) in diameter, or equivalent area, on any platform edge.
Repair method:
Replace the nozzle segment.
Subtask 72-00-52-220-089
(16)Blocked cooling holes:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the nozzle segment.
Subtask 72-00-52-220-058
O.Do an inspection of the borescope hole on the nozzle segment as follows. Refer to Figure 805.
•
Nozzle segment (01-380 , 72-52-00) (SIN 174A1)
•
Nozzle segment (01-381 , 72-52-00) (SIN 174A1) SB 72-0036
•
Nozzle segment (01-382 , 72-52-00) (SIN 174A1) SB 72-0036.
(1)Cracks from the borescope hole (flowpath side only):
Maximum serviceable limit:
Two for each segment, 0.250 inch (6.35 mm) in length and 0.250 inch (6.35 mm) apart. Cracks must be separated 0.500 inch (12.70 mm) from any outer platform crack.
Repair method:
Replace the nozzle segment.
Subtask 72-00-52-220-059
(2)Cracks around the outer platform borescope hole (flowpath side only):
Maximum serviceable limit:
•
Any amount, 0.300 inch (7.62 mm) in length
•
Two cracks, 0.60 inch (15.2 mm) in length, on each platform, if the cracks are a minimum of 0.50 inch (12.7 mm) away from each other and do not touch any other crack
•
If you can see light through the crack, the nozzle segment is unserviceable.
Repair method:
Replace the nozzle segment.
Subtask 72-00-52-220-061
P.Do an inspection of all nozzle segment honeycomb seals. Refer to Figure 805.
•
Nozzle segment (01-370 , 72-52-00) (SIN 174A0)
•
Nozzle segment (01-371 , 72-52-00) (SIN 174A0) SB 72-0036
•
Nozzle segment (01-372 , 72-52-00) (SIN 174A0) SB 72-0036
•
Nozzle segment (01-380 , 72-52-00) (SIN 174A1)
•
Nozzle segment (01-381 , 72-52-00) (SIN 174A1) SB 72-0036
•
Nozzle segment (01-382 , 72-52-00) (SIN 174A1) SB 72-0036.
(1)Rubs:
Maximum serviceable limit:
•
Measure the rub depth in the first and fourth honeycomb seal flat, at eight equally spaced circumferential points around the honeycomb seals.
•
The average of the eight measurements on all nozzle segments for the first honeycomb seal flat must not exceed 0.045 inch (1.14 mm).
•
The average of the eight measurements on all nozzle segments for the fourth honeycomb seal flat must not exceed 0.045 inch (1.14 mm).
•
0.050 inch (1.27 mm) first or fourth honeycomb seal flat on any individual nozzle segment.
Repair method:
Replace the nozzle segment.
Subtask 72-00-52-220-062
(2)Missing honeycomb on each segment:
Maximum serviceable limit:
15 cells on each segment.
Maximum repairable limit:
Replace the nozzle segment.
Subtask 72-00-52-220-064
(3)Honeycomb damage on each nozzle segment:
Maximum serviceable limit:
Three locations on each side, 0.650 inch (16.51 mm) in length, if the total area is not more than 0.80 sq inch (516.1 sq mm).
Repair method:
Replace the nozzle segment.
Subtask 72-00-52-220-065
(4)Cracks in the seal body on each segment:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the nozzle segment.
Subtask 72-00-52-220-066
(5)Nicks and dents on each segment:
Maximum serviceable limit:
Any amount, 0.030 inch (0.76 mm) in depth, if damage does not extend into honeycomb rub grooves.
Repair method:
Replace the nozzle segment.
Subtask 72-00-52-220-067
Q.Do an inspection of the body of each HPT stage 2 shroud (stage 2 shroud) (17800) (this does not include the rub surface) as follows. Refer to Figure 806.
(1)Axial cracks:
Maximum serviceable limit:
0.12 inch (3.0 mm) in length.
Repair method:
Replace the stage 2 shroud.
* * * FOR ALL
Figure 806   Stage 2 Shroud - Inspection
Subtask 72-00-52-220-068
(2)Nicks, dents, and scores:
Maximum serviceable limit:
0.015 inch (0.38 mm).
Repair method:
Replace the stage 2 shroud.
Subtask 72-00-52-220-069
(3)Cracks in the tangential load slot:
Maximum serviceable limit:
One crack permitted, if it does not go into the forward support hook radius.
Repair method:
Replace the stage 2 shroud.
Subtask 72-00-52-220-070
(4)Burns/through holes:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the stage 2 shroud.
Subtask 72-00-52-220-071
(5)Bowing and/or waviness:
Maximum serviceable limit:
0.007 inch (0.18 mm) out of contour, if damage does not prevent assembly.
Repair method:
Replace the stage 2 shroud.
Subtask 72-00-52-220-072
R.Do an inspection of the rub surface of each stage 2 shroud (17800) as follows. Refer to Figure 805.
(1)Axial cracks:
Maximum serviceable limit:
Two cracks, 0.50 inch (12.7 mm) in length.
Repair method:
Replace the stage 2 shroud.
Subtask 72-00-52-220-073
(2)Erosion:
Maximum serviceable limit:
25 percent of the surface, 0.010 inch (0.25 mm) in depth.
Repair method:
Replace the stage 2 shroud.
Subtask 72-00-52-220-074
(3)Circumferential cracks:
Maximum serviceable limit:
Two cracks, 0.010 inch (0.25 mm) in length, if they do not intersect radial cracks.
Repair method:
Replace the stage 2 shroud.
Subtask 72-00-52-220-075
(4)Rubs on the wear track:
Maximum serviceable limit:
0.005 inch (0.13 mm) in depth, along the full width of the segment.
Repair method:
Replace the stage 2 shroud.
Subtask 72-00-52-220-076
(5)Pickup caused by blade rub:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the stage 2 shroud.
Subtask 72-00-52-220-077
S.Do an inspection of all surface areas of each stage 2 shroud C-clip (1780A) as follows. Refer to Figure 807.
(1)Circumferential cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the shroud C-clip.
* * * FOR ALL
Figure 807   Stage 2 Shroud C-Clip - Inspection
Subtask 72-00-52-220-078
(2)Radial and axial cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the shroud C-clip.
Subtask 72-00-52-220-079
(3)Distortion:
Maximum serviceable limit:
0.125 inch (3.18 mm) out of contour, if it does not prevent assembly.
Repair method:
Replace the stage 2 shroud C-clip.
Subtask 72-00-52-220-080
(4)Missing puller lip:
Maximum serviceable limit:
Any amount, if a minimum of 0.090 inch (2.29 mm) of the lip remains.
Repair method:
Replace the shroud C-clip.
Subtask 72-00-52-220-081
T.Do an inspection of all areas of the HPT stage 2 aft retainer (aft retainer) (17808) as follows. Refer to Figure 808.
(1)Circumferential cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the aft retainer.
* * * FOR ALL
Figure 808   Aft Retainer - Inspection
Subtask 72-00-52-220-082
(2)Radial cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the aft retainer.
Subtask 72-00-52-220-083
(3)Distortion:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the aft retainer.
Subtask 72-00-52-220-084
U.Do an inspection of each exposed stage 2 nozzle spline seal (nozzle spline seal), as follows. Refer to Figure 801.
•
Nozzle spline seal (01-395 , 72-52-00) (SIN 174WF) SB 72-0036
•
Nozzle spline seal (01-400 , 72-52-00) (SIN 174WC)
•
Nozzle spline seal (01-410 , 72-52-00) (SIN 174W6)
•
Nozzle spline seal (01-415 , 72-52-00) (SIN 174WG) SB 72-0036
•
Nozzle spline seal (01-420 , 72-52-00) (SIN 174WB)
•
Nozzle spline seal (01-440 , 72-52-00) (SIN 174W4)
•
Nozzle spline seal (01-460 , 72-52-00) (SIN 174W3)
•
Nozzle spline seal (01-465 , 72-52-00) (SIN 174WH) SB 72-0036
•
Nozzle spline seal (01-470 , 72-52-00) (SIN 174W2).
(1)Missing nozzle spline seal (remove seals that are not fully engaged):
Maximum serviceable limit:
Three seals in each seal location can be missing, after the removal of all seals that are not fully engaged. Any number of nozzle spline seals (01-440 , 72-52-00) (SIN 174W4) can be missing.
Repair method:
Replace the nozzle spline seal.
Subtask 72-00-52-220-085
V.Do an inspection of the exposed long axial stage 2 nozzle spline seals (nozzle spline seals) (located at the inner and outer platform only), as follows. Refer to Figure 801.
•
Nozzle spline seal (01-390 , 72-52-00) (SIN 174W5)
•
Nozzle spline seal (01-395 , 72-52-00) (SIN 174WF) SB 72-0036
•
Nozzle spline seal (01-430 , 72-52-00) (SIN 174W8)
•
Nozzle spline seal (01-450 , 72-52-00) (SIN 174W1)
•
Nozzle spline seal (01-455 , 72-52-00) (SIN 174WD) SB 72-0036
•
Nozzle spline seal (01-456 , 72-52-00) (SIN 174WE) SB 72-0036.
(1)Missing seal material:
Maximum serviceable limit:
1.00 inch (25.4 mm) in length at 10 inner platform locations and 10 outer platform locations, if the missing seal material is at the forward edge.
Repair method:
Replace the nozzle spline seal.
Subtask 72-00-52-220-086
W.Do an inspection of each HPT stage 1 spline seal (spline seal) (17302, 17303, 17304, 17305, 17306, 17307, 17308) and each HPT stage 2 spline seal (spline seal) (17802, 17803, 17804, 17805, 17806, 17807), that you can see, in the flowpath area as follows. Refer to Figure 801.
(1)Spline seal that is not fully deteriorated:
Maximum serviceable limit:
10 in each stage.
Repair method:
Replace the spline seal.
Subtask 72-00-52-220-087
(2)Missing spline seal:
Maximum serviceable limit:
Five in each stage.
Repair method:
Replace the spline seal.
Subtask 72-00-52-220-100
X.Do an inspection of the nozzle segment sleeve collar. Refer to Figure 805.
(1)Score marks, wear, or scratches on the ID:
Maximum serviceable limit:
Any amount, 0.005 inch (0.13 mm) in depth.
Repair method:
Repair the nozzle segment. Refer to TASK 72-00-52-300-802 (72-00-52, REPAIR 002).
Subtask 72-00-52-220-101
(2)Braze cracks:
Maximum serviceable limit:
0.250 inch (6.35 mm) total (cumulative) length.
Repair method:
Repair the nozzle segment. Refer to TASK 72-00-52-300-802 (72-00-52, REPAIR 002).
Subtask 72-00-52-220-102
(3)Deformation:
Maximum serviceable limit:
Any amount, if you can assemble the air tube correctly.
Repair method:
Repair the nozzle segment. Refer to TASK 72-00-52-300-802 (72-00-52, REPAIR 002).
Subtask 72-00-52-220-103
Y.Do an inspection of the nozzle segment sleeve. Refer to Figure 805.
(1)Cracks
Maximum serviceable limit:
• Three weld cracks, if not more than two adjacent locations and the sleeve does not lift off of the nozzle seating surface more than 0.005 inch (0.13 mm)
• Cracks, 0.25 inch (6.4 mm) in length, are permitted to extend into the sleeve body.
Repair method:
Repair the nozzle segment. Refer to TASK 72-00-52-300-802 (72-00-52, REPAIR 002).
Subtask 72-00-52-220-104
(2)Missing material or cracks opening:
Maximum serviceable limit:
0.003 sq in. (1.94 sq mm) total (cumulative) area.
Repair method:
Repair the nozzle segment. Refer to TASK 72-00-52-300-802 (72-00-52, REPAIR 002).
Subtask 72-00-52-220-105
(3)Nicks, dents, and gouges:
Maximum serviceable limit:
Any amount, 0.015 inch (0.38 mm) in depth.
Repair method:
Repair the nozzle segment. Refer to TASK 72-00-52-300-802 (72-00-52, REPAIR 002).